Because her name was unusual, she was known primarily without a surname in Europe. She moved to Sweden in 1958. Her first hit in Swedish was "Tror du jag ljuger" from 1961. As a teenager, Gitte sang popular hits in German, English, Italian (4 songs: "Amo Johnny", "Parla", "La mela", and "Il ricordo", recorded on two singles), and Danish. She had five different number one hits in three countries: one in Denmark, two in Sweden, and two in Germany. Her first German number one song was "Ich will 'nen Cowboy als Mann". This recording sold 1.05 million copies by mid 1965, earning Gitte a gold disc.[1]

In the 1960s she also starred in several music and drama movies and on TV in Germany, Denmark, and Sweden.

Gitte was among the most popular Schlager (hit music) singers of the post-war era, and continued to be popular in Germany and Denmark even as American music increasingly dominated the airwaves in the 1970s. Surprisingly at the time, she recorded a jazzalbum with The Kenny Clarke-Francy Boland Big Band in 1968. Through the ensuing decades her singles have still reached the German charts, but never with the same success she enjoyed in the 1960s. In the 1980s, she changed her image and performed more adult-oriented music. She won some awards as a singer/entertainer. Her chart entries ended in the mid 1980s, but she has continued to be a successful live performer to the present day. A number of compilation albums have been recently released in Germany, among them a biographical DVD.

From 2004-2006 she starred with two other Scandinavian entertainers, Wenche Myhre and Siw Malmkvist, in a huge stage and tour success. The live CD recording of their show entered the German charts. In 2010 she presented a new CD, which also had a German chart entry.

She had her first chart entry in 1960 in Sweden and her last in 2010 in Germany.